Depends pn what you mean "ride".
A softer spring lets the wheel react quicker to severe undulations without upsetting the chassis.
A stiffer spring will hold the road better, as it will react to smaller differences quicker, but you end up with a chassis that follows the road.
Stiff springs are NOT a requirement for good performance on the street. Take a look at a Camaro. It has spongy springs, so on rough stuff, it still retains control without pitching the car all about.
Stiffen the springs and you get a car that handles even better, but at the expense of now jarring things loose on the car, developing fatigue cracks in stressed areas, etc...
Damping provided by the shock really determines how well the spring can react to the road surface.
This allows a much softer spring to give wheel travel of a large pothole, without making the frontend dip down thaen back up like astiffer spring would. On the rebound, though, the softer spring will come back quicker, again without experiencing the dip earlier, and you rid e along undisturbed. The stiffer spring would transmit that rebound directly to the chassis, lifting the car front end back up, pitching the dynamicand making for a bit more "busy" driving control scenario.
This assumes similar damping. Stiff springs require softer damping in most cases. Softer springs benefit from stiffer damping, without harshening the ride quality.
I mean, having the ride all bumpy, jumpy, and jarring is what a lot of guys "Think" performance is, but it gcan get really tiring on a 3000 mile drive across the country.
All that being said, the spring rates on my 73 240 Z are 275 #/In up front, and 325 #/In out back. Compare those to what is offered by most spring manufacturers, and you will find that's about 100% stiffer than the off-the-shelf springs you can buy at most places...
I also weighed 330#, so my "chassis Dynamic" is a bit different than most. As well as being jarring at low speeds, you really have to be going 80 or so for these springs to be appreciated. It also gives a new meaning to "as stiff as it can get"...
No, they are not available, you have to have them custom wound. They cost a lot of money, since they are NOT on a coil-over setup, and yes, I don't mind a "stiff" ride in that car...